const arr1 = [1, 4, 9, 16]
arr1.map((item) => {
    // console.log(item)
})
// console.log(arr)

let arr2 = ['aaa', 'bbb', 'ccc'];
let arr3 = arr2.map((x, i,y) => [x, i,y])
console.log(arr3)

